Three separate causes for the reconnect-per-tool-call pain:
- no keep-alive on the standalone GET stream, so reverse proxies with
idle timeouts (nginx default 60s) killed it between calls - send an
SSE comment ping every 25s (MCP_SSE_KEEPALIVE, 0 = off) and count an
open stream as session activity
- the session TTL was hard-coded - MCP_SESSION_TTL (seconds, clamped to
24h) now works as the issue expected
- every addon save invalidated ALL sessions: config-only saves, photo
provider toggles and addons with no MCP surface included. Only a real
enabled-flip of an MCP-relevant addon (or an actual collab-feature
change) tears sessions down now.
Maurice
d320007627